Lens structure.



G..MACBETH.v LENS STRUCTURE. f" APPLIoArIoN FILED un. 1o, 1912'.

Eff/f I INVENTOR.

WJTNESSES.;

ATTORNEY.

Patented Maxl.. 4, 1913;

specification.

UNITED STATES ienaTEnTl orrjron,

Geenen A. MACBET'H, or rrrrsnunan, PENNSYLVANIA.-

LENS STRUCTURE.

To all whom it may concern: y y i Be it known that I, GEORGE A. MACBET'H, Aa citizen of the United States, residing at Pittsburgh, in thecounty of Allegheny and State of Pennsylvania, have inventedvcertain new and useful Improvements in Lens Structures, of which the following is a This invention relates in general toV lens structures, and in particule. to signal lenses composed of two or more sections which may be of d ilerentiy cfiflored glass. It has' for its'primary objects; the=provisio`n`of an improved construction 4of sectional lens wherein the parts are simply but securely held together, and liability of breakage and chipping reduced to a minimum; and the provision of a simple and inexpensive means for securing together the parts comprisin a sectional lens of the characterdescribe These together with -such other objects as may hereinafterv appear orare incidental to my invention, I attain by means 'of a construction illustrated i'n preferred form in the accompanying drawings, wherein :v-

Figure l is a partial plan and sectional lview of a lens embodying my invention, and

Fig. 2 is a partial side elevation and section of the .lens of Fig. l.

comprised of three segments of diiierently colored glass, 7, 8 and 9, which are provided. with the usual prismatic and convex portions. Heretoforelit has been customary in lenses of this character, either to mount the sections separately in the frame or body of the lamp, or to caretully'grind and lit themeans of securing the sections togethen'and l one which -does not require accurate Agrind-l signed my name inthe presence of the two 1015 ving-or counter-boring on (the rim to-match A up the parts sb that they fit the place' in which the lens, when completed, vis to lbe mounted.

In carrying ont my invention, I rst cement the segments or sections together so In the drawings, I have illustrated my in?, 'vention applied to a cylindrical switchlens' Specification of Letters latfmtfi i Ptnted f, Application mea .Tammy 1o, ma.l ',senarno. '370,439.

to'form a rin or double ferrule '10. This lrngis clearly indicated in the sectional part o plated on in any-preferred manner, and is of ig. 12. The' terrule maybe electrosullicient strength to securely hold the segmentsl together; .The advantage obtained by electroplating the band on, is that it is not necessary to have such an accurate finish Aof the edgea'andiths eliminates-a consider- .ablepart of theI grinding'operations herein- 'before referred to. Besides securing 'the segments of glass'together, the ferrule has the additional advantage of preventing chippin and cracking which commonly results om the rou h usa e that lamps'ofV this character `are su jecte y to, and is'` espe-* vcially liable to' occur-in lenses made of a plurality' of sections, thel chippingvtaking place-v generally right at thepoint on the .v rim where two sections are joined. It` will S0 1 be obvious that the invention can be applied to other types of sectional lenses than the one illustrated.` l I, f Having thus described my invention and illustrated-its use, what I'claim as new-andQS.`

desire to secure by Letters Patent is the followingz- 1l A rality of glass sections fitting together and means for securing said sections comprising 9o.

a metallic `band electroplated l in position across the juncture of theksectionsi 2. A cylindrical lens'structure ycomprising a plurality` of parti-cylindrical sections'v litting together, and means. for securin i them together vcomprising a metallic lband' e e'ctro-` plated on the glass. 1 y

3. A cylinder lens structure comprisin a plurality of parti-cylindrical sections fittlng I together,vv and means forsecurmg then to- 10o ether -com rising a metallic electroplated gend 'over t e tpl? and the adjacentledges on both `sides of the glass.,v 1 In testimony whereof I have hereunto subscribed witnesses.

' GEO..A. MACBETH. Witnesses:' y v HAnvEY L. LE'QHNER,

LETITIA. A. MYERS.

that they. remain inposition, and then electroplate a band of metal, .preferably copper, on' the upper and lower ed es of the: glass, v thie metal being depositedA oth inside and Y outside around theedges'ofthe glass, soas 60'.

lens structure composed of a pluy 

